19-year-old American Sloane Stephens just knocked off 15-time Grand Slam champion Serena Williams in the quarterfinals of the Australian Open.

Serena won the first set 6-3, but injured her back in the second set, and didn't look like herself for the rest of the match. Sloane would win the final two sets, 7-5, 6-3, to move on to the semifinals.

And after one point in the third game of the third set, Serena was particularly upset. RACQUET SMASH:

Serena's exit is certainly nice news for the Thigh Goddess, who is currently rolling as she enters the seminfinals. We're quite happy.